#!/usr/bin/env node

const { Readable } = require('stream');

class MyReadable extends Readable{
  constructor(){
    super();
  }

  _read(){
    this.push(String.fromCharCode(this.#c++));
    if(this.#c > 'z'.charCodeAt(0))
      this.push(null);
  }

  #c = 'a'.charCodeAt(0);
}

let rs = new MyReadable();
rs.pipe(process.stdout);
